Wrench.



W. S. THOMSON.

WRENCH.

APPLICATION FILED Nov.1v, 1911.

L1g8$493u PatentedJan.5,19 5

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WILLIAM S. THOMSON, OF PLANTSVILLE, CONNECTICUT, ASSIGNOR TO THE H. 1). SMITH & COMPANY, OF PLANTSVILLE, CONNECTICUT, A CORPORATION.

WRENCH.

Specification of Letters Patent.

Patented J an. 5, 1915.

Application filed November 17, 1911. Serial No. 660,850.

To all whom it may concern I Be it known that I, WILLIAM S. THOM- SON, a citizen of the United States, residing at Plantsville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Wrenches, of which the following is a specification.

My invention relates to improvements in wrenches and the object of my improvement is to produce a wrench having improved mechanism for the adjustment of the jaws and that is suitable to be applied to wrenches either of the type known as adjustable offset or $-wrenches or straight away wrenches and furthermore of such form that the same can be made almost entirely by the drop or die forging process and that is strong and eflicient and reliable in use and has certain features in common with my other application which was issued as Patent No. 1,061,339, May 13, 1913.

In the accompanying drawing :-Figure 1 is a front elevation of my improved wrench. Fig. 2 is a front elevation of the handle member. Fig. 3 is a front elevation of the jaw member. Fig. 4 is a rear elevation of the jaw member. Fig. 5 is a sectional view on an enlarged scale on the line w w of Fig. 1.

My wrench A comprises a handle member B and a movable jaw member C operatively held together in a manner to be described. The handle member B comprises a handle D at one end, a head E at the other end, and a shank I intermediate the said ends. The head E comprises at the extreme outer end the jaw 10, located to one side of the axial tool line. Inward from the jaw 10 is a guide way 11 for the movable jaw member C extending across the axial line. Parallel with the guide way 11 and between the same and the shank F there is a worm G, located in a central slot 12, rotatively mounted on the pivotal pin 13 fixed in the head E. The pivotal pin 13 extends across the body portion of the head E, at about the middle of the thickness thereof. The head E is cut away for about half the thickness of the body portion between the jaw 10 and a line slightly inward from the outer edge of the thread portion of the worm G, except for a central portion which is left slightly raised to form a cross-rib H, the said cut-away portion and rib H constituting the guide Way 11. The jaw 10 is portion of the threaded portion of the worm G is exposed and projects along the lower edge of the way 11.

The rib H is made of appreciable width and adjacent one of the lateral ends, shown as the end correspondingto the jaw 10, is pierced by a hole 17 suitable for fixedly re ceiving a pin I, and extending from adjacent the said hole 17 for the greater portion of the length or lateral extent of the rib H is provided with a slot 18 that is a fit for the body portion of a pin J.

The rear side of the head E is reduced to provide a channel 21 along the rear side of the slot 18 suitably to house the head of the pin J and to provide a way for the inner face thereof.

The jaw member C comprises an L shaped structure having as one arm a jaw 16 extending outwardly suitable for cooperating with the jaw 10 on the handle member B and as the other arm a transversely extending member 19 of relative less thickness, that serves as a guide and operating arm, being essentially the counterpart of the guide way 11 and having at the lower inside corner a. set of teeth K suitably cooperating with the worm G. Accordingly, the inside face of the arm 19 comprises a main bearing surface suitable for bearing against the main surface of the wav 11 and has a recess or groove M that is a fit for the rib H.

The arm 19 is provided with a slot 18 corresponding to the slot 18 in the handle member B and suitablv located to register therewith and a hole 17 on the side of the jaw 10 suitably for fixedly receiving the pin J. The arm 19 is furthermore provided with a channel 21 on the front side, extending along the slot 18 suitable for housing and guiding the head of the guide pin I that is fixed to the handle member B, similarly to the channel 21 provided in the handle member B for housing and guiding the head of the guide pin J that is fixed to the jaw member C.

In operation, turning the worm G operates through the engagement therewith of the teeth or rack K, to move the jaw member 0 transversely, relatively to the handle member B, the arm 19 being guided in its movement by its engagement with the way 11, and the said arm 19 is held in such engagement with the way 11 by means of the heads of the guide pins I and J engaged with the channel ways 21. An important element in such guiding of the jaw member C and handle member B in their movements relatively one to the other is the engagement of the rib H with the recess M, these parts insuring accuracy of movement.

By making the rib H, and corersponcingly, the recess M of appreciable width, I am enabled to provide within the limits of the same the slot 18 to accommodate the body of the guide pins I and J also of appreciable width or thickness.

- By providing two guide pins comprising the pin I fixed in the handle member B and the pin J fixed in the jaw member (J, that is, one fixed in each member and the heads thereof engaged with the guide channel 21 in the mating member, I am enabled to secure effective cooperation of the two pins in holding the jaw member and handle member in engagement as they are moved relatively one to the other. I

The construction of my wrench as described is one that insures strength and re liability of operation and at the same time is such as to permit of forming the handle member B and the jaw member G by the drop forging process and in such a manner as to involve a minimum of finishing to insure accuracy of operation, and by operations that are ordinary and easily applied.

I claim as my invention 1' 1. In a wrench comprising a handle member having a jaw, a way, and a worm having its thread portion projecting into the said way, a jaw member having a jaw and a guide arm fitting the said way and a rack suitable for engaging with the said worm, means for holding the said arm engaged with said way and worm comprising a pair of pins fixedly attached one to each of the said members and the pin in one member passing through a slot in the other member and having its head engaged with the outer face of the said other member.

2. A wrench comprising a handle member Copies of this patent may be obtained for having a way and a jaw at one end thereof and a jaw member having an arm provided with a way and a jaw at one end thereof, one of the said ways having a rib and the other of the said ways having a groove fitting the said rib and engaged therewith, the said rib and groove being of appreciable width and means provided on the said members for holding the said groove engaged with the said rib and comprising holding pins and the said pins passing through the said rib and groove.

3. A wrench comprising a fixed member having a jaw and a movable member having a jaw, the said fixed member having a head provided with an open way extending across one face thereof, and also having a worm, the said movable member having fitting in the said way and having a rack, a rib positioned in the said way and the said arm having a groove fitting the said rib, means for hoidng the said arm in position in the said way and with the said rib engaged with the said groove, and the said means being divided and arranged as a pair, with one of the parts thereof on each side of the general axial line of the wrench.

l. In a wrench having a handle member comprising a body portion and an axially extending jaw and a jaw member having an axially extending jaw and a transversely extending arm, the said body portion and arm provided with eohperative ways and with moving means, means for holding the said ways in engagement comprising a pin on. each of the said members and means for cooperating with the said pin provided on each mating member.

5. In a wrench comprising a handle member and jaw member operatively connected and having a rib on one member and a groove on the other member fitting and engaged therewith, the said members provided with slots in registration extending along the said rib and groove, and a guide pin fixed in each of the said members, having the body portion passing through the slot in the other member and the head engaged with the said other member.

WILLIAM S. THOMSON.

Witnesses GEO. It. BOND, E. H. GALrIN.

Washington, D. C. 

